CN215587021U - VOCs catalytic oxidation monolithic catalyst vacuum coating device - Google Patents

Abstract

A VOCs catalytic oxidation monolithic catalyst vacuum coating device belongs to the field of catalyst preparation. Comprises a vacuum pump (1), an air duct (2), a drying pipe (3), a vacuum meter (4), a storage tank (5), a vacuum coating chamber (6), a coating container (7), a flow guide pipe (8) and a blow-down valve (9). The coating has the advantages of high one-time coating loading rate, high coating uniformity, low blocking rate and high coating efficiency, and is favorable for wetting and adhering a carrier by a coating material.

Description

VOCs catalytic oxidation monolithic catalyst vacuum coating device

Technical Field

The utility model belongs to the field of catalyst preparation, and particularly relates to an integral catalyst preparation device for catalytic oxidation of VOCs.

Background

With further improvement and enhancement of the relevant laws and regulations for preventing and controlling the atmospheric pollution in China, the emission limit value of pollutants is lower and lower. Of these, the problem of Volatile Organic Compounds (VOCs) is of increasing concern and enhanced control thereof is of increasing importance. The catalytic combustion technology is a practical technology for effectively treating VOCs.

In practical engineering application, the powder catalyst often has the problems of large pressure drop of a catalytic bed layer, large using amount of the catalyst, easy blockage of the bed layer and the like. Therefore, the development of the integrally coated catalyst is effective in solving the above problems in practical applications and effectively reducing the amount of noble metal used, thereby having excellent economic, environmental and social benefits. In the preparation process of the monolithic catalyst, the dip coating method is a process of contacting a catalyst or a coating finished product with a carrier, dipping the carrier in slurry configured as required, and loading required components on the surface of the carrier depending on the adsorption performance of the carrier, and has the advantages of simple process and easy operation. The general steps of this technique include: (1) preparing a powder catalyst; (2) preparing catalyst slurry; (3) soaking the carrier in the slurry for loading; (4) and drying and roasting the loaded monolithic catalyst.

The artificial dipping method mainly depends on manually dipping the honeycomb ceramic carrier in the coating slurry, taking out after dipping for a certain time, purging pore channels to avoid blockage, and preparing the catalyst by the processes of drying, roasting and the like; the manual dipping method is simple to operate, equipment is convenient to maintain, but the coating is uneven in thickness and unstable in loading amount, so that the content of a pore channel is easy to block or the coating falls off and cracks, and the effect of the catalyst is seriously influenced. Mechanical coating mostly adopts malleation mode from bottom to top to coat, and coating speed is fast, can realize automatic continuity of operation, but often relies on self action of gravity when thick liquids fall back, causes the coating to go up thin thick down, still has the pore to block up and the emergence of the phenomenon that splits and drops, and mechanical coating equipment is great simultaneously, and one shot production cost is higher, to small-scale production and product test, the cost is high, and causes the material waste easily.

Therefore, a simple and easy-to-operate coating apparatus and method have been developed to improve the uniformity of the monolithic catalyst coating, reduce the peeling rate due to uneven thickness, and achieve efficient coating of the coating slurry.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims to provide a vacuum coating device and a vacuum coating method, which are used for realizing automatic vacuum coating of carriers with different materials, shapes and sizes so as to achieve the purposes of improving the loading rate and uniformity of a catalyst coating and enhancing the firmness of the coating.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a VOCs catalytic oxidation integral catalyst vacuum coating device is characterized by comprising a vacuum pump (1), an air guide pipe (2), a drying pipe (3), a vacuum gauge (4), a storage tank (5), a vacuum coating chamber (6), a coating container (7), a guide pipe (8) and a vent valve (9); the method comprises the following steps that a vacuum pump (1) is connected with a drying pipe (3) through a gas guide pipe (2), a vacuum meter (4) is arranged on the drying pipe (3), the drying pipe (3) is connected with a vacuum coating chamber (6), the drying pipe (3) is used for protecting the vacuum pump (1) and the vacuum meter (4), a storage tank (5) is located above the vacuum coating chamber (6) and is connected with the vacuum coating chamber (6), a coating container (7) is located in the vacuum coating chamber (6), the lower end of the storage tank (5) is connected with the vacuum coating chamber (6) through a flow guide pipe (8), the lower end of the flow guide pipe (8) extends into an opening right above the coating container (7) in the vacuum coating chamber (6), and a valve is arranged on the flow guide pipe (8) and is used for adjusting the flow rate of slurry; the storage tank (5) is used for containing catalyst slurry; the vacuum coating chamber (6) is provided with a vent valve (9). When coating, closing the vacuum coating chamber;

further preferably, the vacuum coating chamber (6) and the coating container (7) are transparent and transparent.

After the integral catalyst carrier is soaked into a coating container (7) filled with slurry, closing a vacuum coating chamber (6), opening a vacuum pump (1), determining the vacuum degree in the vacuum coating chamber through a vacuum gauge (4), formally starting coating when the reading of the pressure gauge reaches the coating vacuum degree standard, finishing coating when no bubble emerges from the slurry, closing the vacuum pump, opening an emptying valve (9), taking out the coated slurry, opening a valve on a flow guide pipe (8), and guiding the slurry in a storage tank (5) into the coating container (7) to perform the next coating operation.

The method for realizing efficient and uniform coating of the catalyst slurry by adopting the device is characterized by comprising the following steps of:

(1) starting a vacuum pump, monitoring the vacuum condition in the vacuum coating chamber through a vacuum gauge, wherein the vacuum indication number suitable for vacuum coating operation is between-0.05 and-0.1 MPa;

(2) closing the guide pipe valve (8), storing the prepared coating slurry in the storage tank (5), simultaneously placing the carrier for forming in the coating container (7), opening the guide pipe valve (8), closing the guide pipe valve (8) when the slurry in the storage tank (5) flows into the coating container (7) and completely impregnates the carrier, and finally closing the vacuum coating chamber (6);

(3) after the slurry in the coating container (7) completely wets the carrier (about 5min), starting the vacuum pump (1), vacuumizing until the index of a vacuum meter (4) is-0.05 to-0.1 MPa, and continuously vacuumizing for 10 to 20 min;

(4) after the vacuum pumping is finished, slowly opening an emptying valve (9), opening a vacuum coating chamber (6) when the indication of a vacuum meter (4) is 0MPa, taking out the coated monolithic catalyst from a coating container (7), blowing off residual slurry in pore channels, drying and roasting to obtain the monolithic catalyst prepared by the vacuum coating method.

Compared with the prior art, the utility model has the remarkable effects that:

1) an automatic vacuum coating mode is adopted, the one-time coating loading rate is high, the coating uniformity is high, the blocking rate is low, and the coating efficiency is high;

2) negative pressure operation is adopted, compared with positive pressure bottom-up extrusion coating, the surface of the carrier adsorbs less gas, and the carrier is favorably wetted and adhered by a coating material;

3) by adopting a semi-continuous slurry adding and carrier replacing coating method, the coating process is simplified, and the coating efficiency is improved;

4) the shape of the coating vessel is not limited, and the type of carrier in the shape of a cylinder, a rectangular parallelepiped or the like can be coated.

Drawings

Fig. 1 is a schematic view of the general structure of the present invention.

In the figure: (1) the device comprises a vacuum pump, (2) a gas guide pipe, (3) a drying pipe, (4) a vacuum meter, (5) a storage tank, (6) a vacuum coating chamber, (7) a coating container, (8) a flow guide pipe and (9) a vent valve.

Detailed Description

The present application is further described with reference to the following drawings, but the present application is not limited to the following examples.

Example 1

Referring to fig. 1, a miniaturized integral vacuum coating machine, (1) a vacuum pump, (2) a gas guide tube, (3) a drying tube, (4) a vacuum gauge, (5) a storage tank, (6) a vacuum coating chamber, (7) a coating container, (8) a flow guide tube and a valve, and (9) an emptying valve. Each joint is provided with a gasket and a sealing ring for sealing.

The parameters of the vacuum coating chamber can be adjusted according to the size of the used carrier, so that the coating of carriers with different volumes can be realized. An appropriate coating vessel is selected based on the shape and size of the carrier and assembled in the form of fig. 1 for carrier coating. The coating slurry is in a vacuum mode in the coating process, and the coating loading rate is calculated by weighing mass after one-time coating, drying and roasting, and the method comprises the following specific steps:

1. after the coating device is assembled, opening a vacuum pump and checking the air tightness;

2. putting a carrier into a coating container, and putting slurry into a storage tank;

3. opening a valve of a drainage tube, enabling the slurry to flow into a coating container through the drainage tube, and closing the valve when the slurry completely covers the carrier;

4. closing the vacuum coating chamber and opening the vacuum pump;

5. when the vacuum representation number is maintained between-0.05 and 0.1MPa, continuously vacuumizing for a period of time until no air bubbles emerge from the slurry in the coating container, and finishing coating;

6. slowly opening an emptying valve (9) until the vacuum indication number is reduced to 0 MPa;

7. opening the vacuum coating chamber, taking out the coated monolithic catalyst from the coating container, blowing off residual slurry in the pore channel, and drying and roasting to obtain the monolithic catalyst;

8. if the carriers with other sizes and shapes need to be coated, the carriers are directly replaced, and the steps from 2 to 7 are repeated.

Claims (2)

1. A VOCs catalytic oxidation integral catalyst vacuum coating device is characterized by comprising a vacuum pump (1), an air guide pipe (2), a drying pipe (3), a vacuum gauge (4), a storage tank (5), a vacuum coating chamber (6), a coating container (7), a guide pipe (8) and a vent valve (9); the method comprises the following steps that a vacuum pump (1) is connected with a drying pipe (3) through a gas guide pipe (2), a vacuum meter (4) is arranged on the drying pipe (3), the drying pipe (3) is connected with a vacuum coating chamber (6), the drying pipe (3) is used for protecting the vacuum pump (1) and the vacuum meter (4), a storage tank (5) is located above the vacuum coating chamber (6) and is connected with the vacuum coating chamber (6), a coating container (7) is located in the vacuum coating chamber (6), the lower end of the storage tank (5) is connected with the vacuum coating chamber (6) through a flow guide pipe (8), the lower end of the flow guide pipe (8) extends into an opening right above the coating container (7) in the vacuum coating chamber (6), and a valve is arranged on the flow guide pipe (8) and is used for adjusting the flow rate of slurry; the storage tank (5) is used for containing catalyst slurry; the vacuum coating chamber (6) is provided with a vent valve (9).

2. A vacuum coating apparatus for a monolithic catalyst for the catalytic oxidation of VOCs as claimed in claim 1, wherein the vacuum coating chamber (6) and the coating vessel (7) are transparent and transparent.

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